Baker Street Herald have been talking about this for at least two years now.
Charter Cities is something that was mentioned in the book Sovereign Individual. Ultra right libertarians want to see the end of the Welfare State and see leaving the EU as the only way to make that happen.
I personally don't think Brexit is a direct consequence of what the Baker Street Herald claim, but it's a part of it. There's evidence from the early 90's that the likes of Murdoch wanted Britain to leave the EU. Him and others like him had zero influence in Brussels and didn't like it.
There's then the huge amounts of money hidden away in Offshore Tax Havens as previously identified by the Panama Papers. It's no coincidence that many behind Brexit are also very rich and don't want their wealth to be identified as they're happy to avoid tax. The EU wanting to expose Offshore Tax Havens spooked the very rich avoiding tax.
Many voting leave were conned into thinking the EU was against them. In reality it's a Social Democratic institution committed to acting in the best interests of all Europeans. Much like much of the European governments in fact. All expect Tory Britain of course.
If people in this country don't wake up to the evidence in front of them, then things go quickly move against the vast majority. If you think austerity was bad, this will be worse as the State is cut all the way back and you're left on your own.